Im A 58 Year Old Male, In Good Shape. I
Not related to each other
Detailed Answer:
Hello dear, welcome to Ask a doctor service. I read your query and here is my advice.
I don't find this both issues related.
I don't think you may be having sinus infection since you no congestion, no blocked nose, no sinus pain.
I don't even think that a sinusitis can give neck pain or vice versa.
You possibly had a cogniuctivitis which is getting better with the usage of the drops you had.
Now possibly you developed another situation with your neck that can be either a muscle strain, poor posture or a neck spinal issue like spondylitis, arthritis, fybromyalgia etc.
You may need to do a x-ray of neck spine.
Hope I have answered the question.
Let me know if I can assist you further.